package com.bwie.filter;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @author 军哥
 * @version 1.0
 * @description: TODO
 * @date 2024/11/4 16:23
 */

@Configuration
public class MyGlobalFilter implements GlobalFilter, Ordered {

    @Autowired
    StringRedisTemplate stringRedisTemplate;
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //-- 获取参数
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String url = request.getURI().toString();
        System.out.println("url:"+url);

        //- 白名单
        if(url.contains("/user/user/login") || url.contains("register")){
            // 放行登录和注册接口
            return chain.filter(exchange);
        }

        //-- 检查token
        String token = request.getHeaders().getFirst("token");
        if(token == null) {
            System.out.println("token为空，请先登录");
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        Claims body = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody();
        Integer userId = body.get("userId", Integer.class);
        String tokenKey = "token-" + userId;
        String redisToken = stringRedisTemplate.opsForValue().get(tokenKey);
        if(redisToken == null) {
            System.out.println("token已过期，请重新登录");
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        if(!redisToken.equals(token)) {
            System.out.println("token错误，请重新登录");
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //-- token续期（token续期30分钟）
        stringRedisTemplate.expire(tokenKey, 60, java.util.concurrent.TimeUnit.MINUTES);

        //-- 放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
